英语听力：2012-02-12 从南极到北极 From Pole To Pole—12

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If surprise fails, there will be a chase. The shark is faster on a straight course, but it can’t turn as sharply as a seal. It’s agility³ versus⁴ power. 

 

Once the seals have finished breeding, the giant sharks will move on. It’s now becoming clear that great whites migrate thousands of miles across the oceans to harvest seasonal⁵ abundances in different seas.

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